SpEL cómo utilizar un parámetro en la llamada de método?

craigwor:

Tengo una aplicación utilizando el programador de primavera y quiero conseguir la expresión cron desde una base de datos. Tengo que trabajar sin un parámetro pero yo requiero un parámetro en la llamada para obtener el calendario de la derecha desde la base de datos (nombre de la programación). He intentado algunas versiones diferentes sin éxito. Por favor ver tanto trabajo y el código que no funciona a continuación como ejemplo de lo que estoy tratando de hacer.

El siguiente código está funcionando:

@Configuration
@EnableScheduling
public class ApplicationConfig {

    @Autowired
    SchedulePropertiesRepository spRepository;

    @Bean   
    public String getCronExpression() {
        ScheduleProperties sp = spRepository.findByScheduleName("date");
        return sp.getCron();
    }
}

y

@Scheduled(cron = "#{@getCronExpression}")
private void cronSchedule() {
     log.info("The time is now {}", dateFormat.format(new Date()));
}

Sin embargo, quiero pasar un parámetro para el nombre de la programación por ejemplo:

@Configuration
@EnableScheduling
public class ApplicationConfig {

    @Autowired
    SchedulePropertiesRepository spRepository;

    @Bean   
    public String getCronExpression(String scheduleName) {
        ScheduleProperties sp = spRepository.findByScheduleName(scheduleName);
        return sp.getCron();
    }
}

y

@Scheduled(cron = "#{@getCronExpression('date')}")
private void cronSchedule() {
     log.info("The time is now {}", dateFormat.format(new Date()));
}

Pero esto me la siguiente excepción:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scheduler' defined in file [Scheduler.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelParseException: EL1041E: After parsing a valid expression, there is still more data in the expression: 'lparen(()'
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:603) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.5.RELEASE.jar:2.2.5.RELEASE]
    at main(GeniusPrintDocExtractorApplication.java:12) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_241]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_241]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_241]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_241]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.2.5.RELEASE.jar:2.2.5.RELEASE]
Caused by: org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelParseException: EL1041E: After parsing a valid expression, there is still more data in the expression: 'lparen(()'
    at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:164) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.config.EmbeddedValueResolver.resolveStringValue(EmbeddedValueResolver.java:56) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.processScheduled(ScheduledAnnotationBeanPostProcessor.java:412) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.lambda$null$1(ScheduledAnnotationBeanPostProcessor.java:362) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at java.lang.Iterable.forEach(Iterable.java:75) ~[na:1.8.0_241]
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.lambda$postProcessAfterInitialization$2(ScheduledAnnotationBeanPostProcessor.java:362) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:1.8.0_241]
    at org.springframework.scheduling.annotation.ScheduledAnnotationBeanPostProcessor.postProcessAfterInitialization(ScheduledAnnotationBeanPostProcessor.java:361) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization(AbstractAutowireCapableBeanFactory.java:431) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1800) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    ... 20 common frames omitted
Caused by: org.springframework.expression.spel.SpelParseException: EL1041E: After parsing a valid expression, there is still more data in the expression: 'lparen(()'
    at org.springframework.expression.spel.standard.InternalSpelExpressionParser.doParseExpression(InternalSpelExpressionParser.java:135) ~[spring-expression-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.expression.spel.standard.SpelExpressionParser.doParseExpression(SpelExpressionParser.java:61) ~[spring-expression-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.expression.spel.standard.SpelExpressionParser.doParseExpression(SpelExpressionParser.java:33) ~[spring-expression-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.expression.common.TemplateAwareExpressionParser.parseExpressions(TemplateAwareExpressionParser.java:121) ~[spring-expression-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.expression.common.TemplateAwareExpressionParser.parseTemplate(TemplateAwareExpressionParser.java:62) ~[spring-expression-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.expression.common.TemplateAwareExpressionParser.parseExpression(TemplateAwareExpressionParser.java:49) ~[spring-expression-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:142) ~[spring-context-5.2.4.RELEASE.jar:5.2.4.RELEASE]
    ... 30 common frames omitted

¿Hay una manera de hacer lo que necesito?

Andreas:

@getCronExpressionno es una llamada a un método, es una referencia a un bean por su nombre. Véase la documentación de Primavera .

En su lugar, retire la @Beananotación, el nombre de la haba de configuración para que pueda referirse a ella, a continuación, llamar al método.

@Configuration("myApplicationConfig")
@EnableScheduling
public class ApplicationConfig {

    @Autowired
    SchedulePropertiesRepository spRepository;

    public String getCronExpression(String scheduleName) {
        ScheduleProperties sp = spRepository.findByScheduleName(scheduleName);
        return sp.getCron();
    }
}

y

@Scheduled(cron = "#{@myApplicationConfig.getCronExpression('date')}")
private void cronSchedule() {
     log.info("The time is now {}", dateFormat.format(new Date()));
}